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UNIRAS Brief - 605/04 - eEye Digital Security Advisory: RealPlayer Zipped Skin File Buffer Overflow



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 605/04 dated 28.10.04  Time: 12:50  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

eEye Digital Security Advisory: RealPlayer Zipped Skin File Buffer Overflow

Detail
====== 

eEye Digital Security has discovered a vulnerability in RealPlayer that allows 
a remote attacker to reliably overwrite the stack with arbitrary data and execute 
arbitrary code in the context of the user under which the player is running.




RealPlayer Zipped Skin File Buffer Overflow

Release Date:
October 27, 2004

Date Reported:
October 11, 2004

Severity:
High (Code Execution)

Vendor:
RealNetworks

Systems Affected:
For Microsoft Windows
RealPlayer 10.5 (6.0.12.1053 and earlier)
RealPlayer 10
RealOne Player v2
RealOne Player v1

Overview:
eEye Digital Security has discovered a vulnerability in RealPlayer that allows 
a remote attacker to reliably overwrite the stack with arbitrary data and 
execute arbitrary code in the context of the user under which the player is 
running.

Technical Details:
A RealPlayer skin file (.rjs extension) can be downloaded and applied automatically 
through a web browser without the user's permission. A skin file is a bundle of 
graphics and a .ini file, stored together in ZIP format. DUNZIP32.DLL, which is 
included with RealPlayer, is used to extract the contents of the skin file. When 
an .rjs file containing a long file name (greater than around 0x8000 bytes) is 
opened, either in RealPlayer or through a web browser, a stack based buffer overflow 
occurs, allowing an exception handler record to be overwritten and EIP to be hijacked.

Protection:
Retina Network Security Scanner has been updated to identify this vulnerability.

Vendor Status:
RealNetworks has released a patch for this vulnerability. The patch is available 
via the "Check for Update" menu item under Tools on the RealPlayer menu bar. 
"Security Update - Skin File Overflow" Recommended Player Update: Resolves a 
security vulnerability when activating a specifically malformed skins file. 
Skins files available on RealNetworks site are examined before being posted. 
Skins files from other sources should be treated with caution. 

Credit:
Discovery: Yuji Ukai

Related Links:
Retina Network Security Scanner - Free 15 Day Trial 
http://www.eeye.com/html/Products/Retina/download.html

Greetings:
TCC, YY, KEN, O.C., Guys@Shinbashi_Sanuki-Iyo_Place, Guys@NightLandSlotmachinePlayroom

Copyright (c) 1998-2004 eEye Digital Security
Permission is hereby granted for the redistribution of this alert electronically. 
It is not to be edited in any way without express consent of eEye. If you wish to 
reprint the whole or any part of this alert in any other medium excluding electronic 
medium, please email alert@xxxxxxxx for permission.

Disclaimer
The information within this paper may change without notice. Use of this information 
constitutes acceptance for use in an AS IS condition. There are no warranties, 
implied or express, with regard to this information. In no event shall the author be 
liable for any direct or indirect damages whatsoever arising out of or in connection 
with the use or spread of this information. Any use of this information is at the user's own risk.


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For additional information or assistance, please contact the HELP Desk by 
telephone or Not Protectively Marked information may be sent via 
EMail to: uniras@xxxxxxxxxxxx

Office Hours:
Mon - Fri: 08:30 - 17:00 Hrs
Tel: +44 (0) 870 487 0748 Ext 4511
Fax: +44 (0) 870 487 0749

Outside of Office Hours:
On Call Duty Officer:
Tel: +44 (0) 870 487 0748 and follow the prompts

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UNIRAS wishes to acknowledge the contributions of eEye Digital for the information 
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

Reference to any specific commercial product, process, or service by trade 
name, trademark manufacturer, or otherwise, does not constitute or imply 
its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
and opinions of authors expressed within this notice shall not be used for 
advertising or product endorsement purposes.

Neither UNIRAS or NISCC shall also accept responsibility for any errors 
or omissions contained within this briefing notice. In particular, they shall 
not be liable for any loss or damage whatsoever, arising from or in connection 
with the usage of information contained within this notice.

UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) 
and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
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<End of UNIRAS Briefing>

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